Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Hobokense Polder | 29 September | Hobokense Polder | 5 November | |||||
| 2021 | Hobokense Polder | 28 September | Hobokense Polder | 10 November | |||||
| 2020 | Hobokense Polder | 9 October | Hobokense Polder | 6 November | |||||
| 2019 | Hobokense Polder | 12 October | Hobokense Polder | 25 October | |||||
| 2018 | Hobokense Polder | 5 October | Hobokense Polder | 4 November | |||||
| 2017 | Hobokense Polder | 1 October | Hobokense Polder | 3 November | |||||
| 2016 | Hobokense Polder | 2 April | Hobokense Polder | 4 November | |||||
| 2015 | Hobokense Polder | 3 October | Hobokense Polder | 31 October | |||||
| 2014 | Hobokense Polder | 20 March | Hobokense Polder | 2 November | |||||
| 2013 | Hobokense Polder | 8 April | Hobokense Polder | 31 October | |||||
| 2012 | Hobokense Polder | 8 April | Hobokense Polder | 31 October | |||||
| 2011 | Hobokense Polder | 24 September | Hobokense Polder | 2 November | |||||
| 2010 | Hobokense Polder | 29 September | Hobokense Polder | 8 November | |||||
| 2009 | Hobokense Polder | 3 October | Hobokense Polder | 8 November | |||||
| 2008 | Hobokense Polder | 27 September | Hobokense Polder | 6 November | |||||
| 2007 | Hobokense Polder | 4 October | Hobokense Polder | 12 November | |||||
| 2006 | Hobokense Polder | 27 October | Hobokense Polder | 5 November |
